IE asks for username and password?? help please

When i try to open Internet Explorer it pops up a window and ask for my username and password to my router (linksys) the router is wireless but im not running wireless, also i do not need to type in any of that information to use the internet if i "X out" of the window the internet will continue to load any web page i would like to visit it just pops up every couple of seconds and if i do put in that information the same thing happens except the window wont come back. ive been dealing with it for a bit now but its getting annoying any help would be appreciated